Bosch GTR55-85 9 User manual

Operating / Safety Instructions

Consignes d’utilisation / de sécurité

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IMPORTANT

Read Before Using ●IMPORTANT

Lire avant usage ●IMPORTANTE

Leer antes de usar

1-877-BOSCH99 (1-877-267-2499) www.boschtools.com

GTR55-85

-2-

The definitions below describe the level of severity for each signal word.

Please read the manual and pay attention to these symbols.

!This is the safety alert symbol. It is used to alert you to potential personal injury hazards.

Obey all safety messages that follow this symbol to avoid possible injury or death.

DANGER indicates a hazardous situation which, if not avoided, will result in death or serious

injury.

WARNING indicates a hazardous situation which, if not avoided, could result in death or

serious injury.

CAUTION indicates a hazardous situation which, if not avoided, could result in minor or

moderate injury.

Table of Contents

Safety Symbols

Safety Symbols .................................2

General Power Tool Safety Warnings ................3

Safety Rules for Random Orbital

Sanders ...................................5

Additional Safety Warnings .......................6

Intended Use...................................6

Speciﬁcations ..................................7

Symbols.......................................8

Getting to Know Your Drywall Sander ............. 10

Assembly.................................... 12

Changing the Sanding Sheet................. 12

Selection of the Sanding Pad ................ 12

Changing the Intermediate Pad (GTR800) ..... 12

Changing the Sanding Pad .................. 13

Inserting and Removing

Extension Tubes....................... 13

Attaching the Vacuum Hose ................. 14

Installing/Removing the

Hose/Cable Clip . . . . . . . . . . . . . . . . . . . . . . . 14

Dry Wall Sander Operation...................... 15

Starting Operation......................... 15

Preselecting the Speed..................... 15

Applications.............................. 15

On/Oﬀ Slide Switch........................ 15

Sanding Surfaces ......................... 16

Sanding Close to Edges..................... 16

Adjusting the Internal/External

Airﬂow............................... 16

Adjusting Suction Power.................... 17

Changing the Connection Hose .............. 17

Troubleshooting .............................. 19

Maintenance ................................. 21

Service .................................. 21

Tool Lubrication........................... 21

Motors .................................. 21

Cleaning ................................. 21

Accessory Storage and

Maintenance.......................... 21

Extension Cords .............................. 22

Accessories and Attachments ................... 22

-3-

General Power Tool Safety Warnings

Read all safety warnings, instructions, illustrations and speciﬁcations provided with this power

tool. Failure to follow all instructions listed below may result in electric shock, ﬁre and/or serious injury.

SAVE ALL WARNINGS AND INSTRUCTIONS FOR FUTURE REFERENCE

The term “power tool” in the warnings refers to your mains-operated (corded) power tool or battery-operated (cordless) power

tool.

SAVE THESE INSTRUCTIONS

1. Work Area Safety

a. Keep work area clean and well lit. Cluttered or dark

areas invite accidents.

b. Do not operate power tools in explosive atmospheres,

such as in the presence of ﬂammable liquids, gases

or dust. Power tools create sparks which may ignite the

dust or fumes.

c. Keep children and bystanders away while operating a

power tool. Distractions can cause you to lose control.

2. Electrical Safety

a. Power tool plugs must match the outlet. Never modify

the plug in any way. Do not use any adapter plugs

with earthed (grounded) power tools. Unmodiﬁed

plugs and matching outlets will reduce risk of electric

shock.

b. Avoid body contact with earthed or grounded surfac-

es, such as pipes, radiators, ranges and refrigerators.

There is an increased risk of electric shock if your body is

earthed or grounded.

c. Do not expose power tools to rain or wet conditions.

Water entering a power tool will increase the risk of

electric shock.

d. Do not abuse the cord. Never use the cord for carrying,

pulling or unplugging the power tool. Keep cord away

from heat, oil, sharp edges or moving parts. Damaged or

entangled cords increase the risk of electric shock.

e. When operating a power tool outdoors, use an exten-

sion cord suitable for outdoor use. Use of a cord suit-

able for outdoor use reduces the risk of electric shock.

f. If operating a power tool in a damp location is

unavoidable, use a Ground Fault Circuit Interrupter

(GFCI) protected supply. Use of an GFCI reduces the

risk of electric shock.

3. Personal Safety

a. Stay alert, watch what you are doing and use common

sense when operating a power tool. Do not use a

power tool while you are tired or under the inﬂuence of

drugs, alcohol or medication. A moment of inatten-

tion while operating power tools may result in serious

personal injury.

b. Use personal protective equipment. Always wear eye

protection. Protective equipment such as a dust mask,

non-skid safety shoes, hard hat, or hearing protection

used for appropriate conditions will reduce personal

injuries.

c. Prevent unintentional starting. Ensure the switch is in

the oﬀ-position before connecting to power source and /

or battery pack, picking up or carrying the tool. Carrying

power tools with your ﬁnger on the switch or energizing

power tools that have the switch on invites accidents.

d. Remove any adjusting key or wrench before turning

the power tool on. A wrench or a key left attached to

a rotating part of the power tool may result in personal

injury.

e. Do not overreach. Keep proper footing and balance at

all times. This enables better control of the power tool in

unexpected situations.

f. Dress properly. Do not wear loose clothing or jewelry.

Keep your hair and clothing away from moving parts.

Loose clothes, jewelry or long hair can be caught in

moving parts.

h. Do not let familiarity gained from frequent use of

tools allow you to become complacent and ignore tool

safety principles. A careless action can cause severe

injury within a fraction of a second.

4. Power Tool Use and Care

a. Do not force the power tool. Use the correct power

tool for your application. The correct power tool will

do the job better and safer at the rate for which it was

designed.

b. Do not use the power tool if the switch does not turn

it on and oﬀ. Any power tool that cannot be controlled

with the switch is dangerous and must be repaired.

c. Disconnect the plug from the power source and/or

remove the battery pack from the power tool before

making any adjustments, changing accessories, or

-4-

General Power Tool Safety Warnings

storing power tools. Such preventive safety measures

reduce the risk of starting the power tool accidentally.

d. Store idle power tools out of the reach of children and

do not allow persons unfamiliar with the power tool

or these instructions to operate the power tool. Power

tools are dangerous in the hands of untrained users.

e. Maintain power tools and accessories. Check for

misalignment or binding of moving parts, breakage

of parts and any other condition that may aﬀect the

power tool’s operation. If damaged, have the power

tool repaired before use. Many accidents are caused by

poorly maintained power tools.

f. Keep cutting tools sharp and clean. Properly main-

tained cutting tools with sharp cutting edges are less

likely to bind and are easier to control.

g. Use the power tool, accessories and tool bits etc.

in accordance with these instructions, taking into

account the working conditions and the work to be

performed. Use of the power tool for operations dif-

ferent from those intended could result in a hazardous

situation.

h. Keep handles and grasping surfaces dry, clean and

free from oil and grease. Slippery handles and grasping

surfaces do not allow for safe handling and control of the

tool in unexpected situations.

5. Service

a. Have your power tool serviced by a qualiﬁed repair

person using only identical replacement parts.

This will ensure that the safety of the power tool is

maintained.

SAVE THESE INSTRUCTIONS

-5-

Safety Rules for Random Orbital Sanders

a. Hold power tool by insulated gripping surfaces, when

performing an operation where the sanding disk may

contact its own cord. Sanding disk contacting a “live”

wire may make exposed metal parts of the power tool

“live” and could give the operator an electric shock.

b. Unplug the sander before changing accessories. Ac-

cidental start-ups may occur if sander is plugged in while

changing an accessory.

c. If your tool is equipped with a dust bag, empty it fre-

quently and after completion of sanding. Be extremely

careful of dust disposal, materials in ﬁne particle form

may be explosive. Do not throw sanding dust on an open

ﬁre. Spontaneous combustion may, in time, result from

mixture of oil or water with dust particles.

d. Always wear eye protection and a dust mask for dusty

applications and when sanding overhead. Sanding

particles can be absorbed by your eyes and inhaled eas-

ily and may cause health complications.

e. Use special precautions when sanding chemically

pressure treated lumber, paint that may be lead

based, or any other materials that may contain car-

cinogens. A suitable breathing respirator and protective

clothing must be worn by all persons entering the work

area. Work area should be sealed by plastic sheeting and

persons not protected should be kept out until work area

is thoroughly cleaned.

f. Do not wet sand with this sander. Liquids entering the

motor housing is an electrical shock hazard.

g. Do not use PSA pad on random orbit sanders whose

speed exceeds 12,000/min. Exceeding the maximum

operating speed of pad may cause pad to rupture or ﬂy

apart during use striking user or bystanders.

h. Do not use sandpaper intended for larger sanding

pads. Larger sandpaper will extend beyond the sanding

pad causing snagging, tearing of the paper or kick-back.

Extra paper extending beyond the sanding pad can also

cause serious lacerations.

i. Be aware of the location and setting of the Switch

“Lock-ON” Button. If the switch is locked “ON”, be ready

for emergency situations to switch it “OFF”, by ﬁrst

pulling the trigger then immediately releasing it without

pressing the “Lock-ON” button.

j. Clamp or secure workpiece when sanding. Clamping

the workpiece prevents it from being ejected from under

the sander and leaves both hands to control the tool.

k. Keep the cord away from the spinning pad and sand-

paper. The cord can become entangled with the pad.

SAVE THESE INSTRUCTIONS

-6-

SAVE THESE INSTRUCTIONS

Do not hold the vacuum hose against any body parts dur-

ing operation. Static electricity build-up in the hose during

operation may result in static shock.

GFCI and personal protection devices like electrician’s rubber

gloves and footwear will further enhance your personal safety.

Do not use AC only rated tools with a DC power supply.

While the tool may appear to work, the electrical components

of the AC rated tool are likely to fail and create a hazard to the

operator.

Develop a periodic maintenance schedule for your tool.

When cleaning a tool be careful not to disassemble any

portion of the tool since internal wires may be misplaced

or pinched or safety guard return springs may be improp-

erly mounted. Certain cleaning agents such as gasoline, car-

bon tetrachloride, ammonia, etc. may damage plastic parts.

Use this tool only as intended. Un-

intended use may result in personal

injury and property damage.

The power tool is intended for dry sanding dry wall that has

had drywall plaster applied to close seams and blemishes,

ceilings and walls in indoor and outdoor areas, and for remov-

ing coats of paint, adhesive residues and loose plaster.

This power tool is not suitable for bench-mounted use. It

must not be clamped into a vice or fastened to a workbench.

Some dust created by power sand-

ing, sawing, grinding, drilling, and

other construction activities contains chemicals known to

cause cancer, birth defects or other reproductive harm.

Some examples of these chemicals are:

• Lead from lead-based paints,

• Crystalline silica from bricks and cement and other

masonry products, and

• Arsenic and chromium from chemically-treated lumber.

Your risk from these exposures varies, depending on how

often you do this type of work. To reduce your exposure to

these chemicals: work in a well ventilated area, and work with

approved safety equipment, such as those dust masks that

are specially designed to ﬁlter out microscopic particles.

Additional Safety Warnings

Intended Use

-7-

Specifications

Model Number GTR55-85

Speed preselection

Constant electronic control

Soft start

Voltage rating 120 V

Rated power 4.5A

No-load speed n₀ min−1 340–910

Sanding pad diameter 8.5" (215 mm)

Sanding sheet diameter 9" (225 mm)

Dust extraction diameter 1.7/1.3" (45/35 mm)

Short version length

(without extension tube) 43.31" (1.1 m)

Standard version length

(with one extension tube) 66.93" (1.7 m)

Long version length

(with two extension tubes) 90.55" (2.3 m)

Weight

Short version 9.04 lbs (4.1 kg)

Standard version 10.58 lbs (4.8 kg)

-8-

Symbols

Important: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper inter-

pretation of these symbols will allow you to operate the tool better and safer.

Symbol Designation/Explanation

V Volts (voltage)

A Amperes (current)

Hz Hertz (frequency, cycles per second)

W Watt (power)

kg Kilograms (weight)

min Minutes (time)

s Seconds (time)

⌀Diameter (size of drill bits, grinding wheels, etc.)

n0No load speed (rotational speed, at no load)

n Rated speed (Maximum attainable speed)

.../min Revolutions or reciprocation per minute (revolutions, strokes, surface speed, orbits etc. per minute)

0 Oﬀ position (zero speed, zero torque...)

1, 2, 3, ...

I, II, III, Selector settings (speed, torque or position settings. Higher number means greater speed)

0

Inﬁnitely variable selector with oﬀ (speed is increasing from 0 setting)

Arrow (action in the direction of arrow)

Alternating current (type or a characteristic of current)

Direct current (type or a characteristic of current)

Alternating or Direct current (type or a characteristic of current)

Class II construction (designates Double Insulated Construction tools)

Earthing terminal (grounding terminal)

-9-

Symbols

Important: Some of the following symbols may be used on your tool. Please study them and learn their meaning. Proper inter-

pretation of these symbols will allow you to operate the tool better and safer.

Symbol Designation/Explanation

Alerts user to read manual.

Alerts user to wear eye protection.

Alerts user to wear hearing protection.

Alerts user to wear respiratory protection.

This symbol designates that this tool is listed by the Canadian Standards

Association, to United States and Canadian Standards.

-10-

Disconnect power cord from tool before making any assembly, adjustments or changing acces-

sories. Such preventive safety measures reduce the risk of starting the tool accidentally.

Getting to Know Your Drywall Sander

1

2

4

8

6

10

3

14

15

17

19

5

9

7

13

12

8

9

11

13

16

18

20

9

Fig. 1

-11-

Getting to Know Your Drywall Sander

1 Suction Power Thumbwheel

2 Speed Preselection Thumbwheel

3 On/Oﬀ Slide Switch

4 Handle (Insulated Gripping Surface)

5 Vacuum Hose

6 Vacuum Outlet

7 Handle Section

8 Safety Hook

9 Clamping Lever

10 Extension Tube

11 Sanding Head

12 Brush Segment Locking Mechanism

13 Suction Power Adjusting Lever

14 Sanding Sheet

15 Intermediate Pad

16 Screw for Sanding Pad

17 Sanding Pad

18 Brush Segment

19 Connection Hose

20 Sanding Pad Holder

-12-

Changing the Sanding Sheet

(Fig. 2)

To remove the Sanding Sheet 14, lift it from the side and

pull it oﬀ the Intermediate Pad 15. Remove any dirt or debris

from Intermediate Pad 15 with a brush before attaching a

new sanding sheet. Use hook and loop style sanding sheets

to properly secure to Intermediate Pad 15, press the Sanding

Sheet 14 ﬁrmly onto the underside of the Intermediate Pad

15.

To ensure optimum dust extraction, make sure that the

punched holes in the Sanding Sheet 14 are aligned with the

punched holes in the Intermediate Pad 15 and the drilled

holes in the Sanding Pad 17.

Note: An Intermediate Pad 15 is not required when working

with the medium-hard sanding pad; the Sanding Sheet 14 is

attached directly to the Sanding Pad 17. In all other cases, the

change is performed as described here.

Assembly

Selection of the Sanding Pad

Soft Sanding Pad Set (GTR801)

• For universal use on ﬂat and curved surfaces.

• The set consists of a soft sanding pad and an intermedi-

ate pad.

The sanding pad may only be used with an intermediate pad.

Medium/Hard Sanding Pad (GTR802)

• High material removal rate, ideal for hard plaster and

removing old wall paints

• For use on ﬂat surfaces

• Optimal suction support makes work easier when using

a dust extractor.

Changing the Intermediate Pad (GTR800)

(Fig. 2)

An Intermediate Pad 15 must always be used when working

with the soft sanding pad (included with the drywall sander).

To remove the Intermediate Pad 15 lift it from the side and pull

it oﬀ the Sanding Pad 17.

Remove dirt and dust from the Sanding Pad 17, e.g. with a

paintbrush, before attaching a new intermediate pad.

The surface of the Sanding Pad 17 is ﬁtted with a hook-and-

loop fastening, allowing intermediate pads to be secured

quickly and easily.

Press the Intermediate Pad 15 ﬁrmly against the underside of

the Sanding Pad 17.

To ensure optimum dust extraction, make sure that the

punched holes in the Intermediate Pad 15 are aligned with

the drilled holes in the Sanding Pad 17.

Disconnect power cord from tool before making any assembly, adjustments or changing acces-

sories. Such preventative safety measures reduce the risk of starting the tool accidentally.

Fig. 2

14

15

17

-13-

Changing the Sanding Pad

(Fig. 2, Fig. 3)

Observe for and replace damaged

sanding pad immediately. Using a

damaged sanding pad could cause a hazard.

Pull oﬀ the Sanding Sheet 14 and the Intermediate Pad

15. While grabbing the Sanding Pad 17, turn the screw 16

counter-clockwise to loosen completely and remove it. Attach

the new Sanding Pad 17 and retighten the screw by turning

it clockwise.

Note: For proper ﬁt, the keyed hub on the sanding pad must

align with the keyed ﬂange on the Sanding Head Output Shaft

21.

Assembly

Inserting and Removing Extension Tubes

(Fig. 4)

Use the Extension Tubes 10 when necessary. The eﬀort re-

quired to perform the sanding operation is reduced when

working without the extension tube.

Note: A maximum of two extension tubes may be inserted.

Undoing the Connection between Sanding

Head/Handle Section/Extension Tube

(Fig. 1, Fig. 4)

1. Open the Clamping Lever 9 .

2. Open the Safety Hook 8 .

3. Pull the previously connected parts apart .

Fastening the Connection between Sanding

Head/Handle Section/Extension Tube

(Fig. 1, Fig. 5)

1. Slide the Sanding Head 11, Handle Section 7, and/or

Extension Tubes 10 into each other depending on the

required connection .

2. Close the Safety Hook 8 .

3. Push the Clamping Lever 9 until it is at a right angle to

the Sanding Head 11, Handle Section 7, or Extension

Tube 10 .

4. To avoid loosening during operation, ﬁrmly tighten the

Eccentric Screw 22 clockwise .

5. Close the Clamping Lever 9 by pressing it back in place

.

17

16

21

Fig. 3

9

8

9

10

7

11

10

11

10 7

10

7

11

Fig. 4

-14-

Always check that all the connection elements are secured

with the Safety Hooks 8 and clamping levers 9 and are ﬁrmly

attached.

Attaching the Vacuum Hose

(Fig. 1)

Attach the Vacuum Hose 5 to the Vacuum Outlet 6 on the

Handle Section 7.

Connect the Vacuum Hose 5 to a vacuum (sold separately).

The vacuum must be suitable for the material being sanded.

When working on vertical surfaces, hold the drywall sander

with the Vacuum Hose 5 facing downwards.

Installing/Removing the Hose/Cable Clip

(Fig. 6)

Place the Hose/Cable Clip 23 over the Vacuum Hose 5 .

Insert the power cable into the cable groove of the Hose/

Cable Clip 23 .

To remove the Hose/Cable Clip 23, pull it oﬀ the Vacuum Hose

5 and remove the power cable from the Hose/Cable Clip 23.

Assembly

5

23

Fig. 6

7

11

922

8

89

Fig. 5

-15-

Dry Wall Sander Operation

Starting Operation

Pay attention to the mains voltage. The voltage of the power

source must match the voltage speciﬁed on the rating plate of

the power tool. Power tools marked with 120V can and should

be operated with 120V.

Preselecting the Speed

You can preselect the required speed using the Speed Pre-

selection Thumbwheel 2, even during operation. The higher

numbers indicate a high speed, while the smaller ones repre-

sent a low speed.

The Constant Electronic keeps the speed at no load and under

load virtually consistent, producing uniform performance.

The electronic soft start limits the torque when the power tool

is switched on and increases the service life of the motor.

Applications

See the table "Applications" below for application informa-

tion.

Do not put the power tool down on its side. This could per-

manently warp the sanding pad.

On/Oﬀ Slide Switch

(Fig. 1)

Hold the tool with both hands while

turning on or oﬀ the tool. Torque

from the motor can cause the tool to twist.

To turn the tool "ON," slide the On/Oﬀ Slide Switch 3 forward

so that "I" appears on the switch.

To turn the tool "OFF," slide the On/Oﬀ Slide Switch 3 back-

wards so that "0" appears on the switch.

Applications

joint compound/

plaster hardness wall or ceiling

internal/external

air ﬂow setting suction power speed setting

sanding

sheet grit

very soft/soft wall or ceiling 1 6 2–4 from P180

medium hardness

wall 1 6

4–6 from P120

ceiling 3 1–5

(optimum: 3)

extremely hard wall or ceiling

1 on uneven

surfaces 64–6 from P100

3 on even surfaces 1–3

-16-

Sanding Close to Edges

(Fig. 7, Fig. 8)

Taking out the removable Brush Segment 18 helps reduce the

lateral distance between the edges/corners and the sanding

pad.

• Press and hold the Locking Mechanism 12 for the Brush

Segment 18.

• Swivel the Brush Segment 18 forwards and remove it.

• To insert, hook the Brush Segment 18 onto the opposite

side of the Locking Mechanism 12, and swivel it towards

the Sanding Head 11 until it clicks into place.

Adjusting the Internal/External Airﬂow

(Fig. 1)

You can switch between diﬀerent air ﬂow operating modes de-

pending on the intended use. Turn the Suction Power Adjust-

ing Lever 13 to one of the 3 positions. (See the table "Adjust-

ing the Internal/External Airﬂow" on page 17.)

Dry Wall Sander Operation

Sanding Surfaces

Always wait until the power tool

has come to a complete stop be-

fore placing it down. The spinning accessory may grab a sur-

face and cause you to lose control of the power tool.

Switch the power tool on, place the entire sanding surface

against the surface of the workpiece and apply moderate

pressure as you move the sander over the workpiece.

The material removal rate and sanding result are primarily

determined by the choice of sanding sheet, the preselected

speed setting and the contact pressure.

Only new or unused sanding sheets achieve good sanding per-

formance and make the power tool last longer.

Be sure to apply consistent contact pressure in order to in-

crease the lifetime of the sanding sheets.

Excessively increasing the contact pressure will not lead to

increased sanding performance, rather it will cause more se-

vere wear of the power tool and of the sanding sheet.

Do not use a sanding sheet for other materials after it has been

used to work on metal.

Fig. 8

12

18

11

Fig. 7

-17-

Dry Wall Sander Operation

Adjusting Suction Power

(Fig. 1)

You can adjust the suction power to achieve your preferred

balance between sanding speed and suction power. This is

only possible when the Suction Power Adjusting Lever 13 is

set to position 3. (See the table "Adjusting the Internal/Exter-

nal Airﬂow" below.)

Adjust the suction power with the Thumbwheel 1:

• 1−5: Low to high suction power, suitable for sanding

ceilings

• 6: Highest suction power, suitable for sanding walls

Start with a low suction power (position 1) and increase slow-

ly, until there is a noticeable contact pressure.

High suction power allows low-fatigue sanding of ceilings and

walls. An excessively high suction power can cause the power

tool to vibrate, which can make handling more diﬃcult.

Changing the Connection Hose

(Fig. 9)

Removing the Connection Hose

To remove the Connection Hose 19, loosen the screw on the

Hose Clamp 24 with a screwdriver and lift the Hose Clamp 24

oﬀ with the Connection Hose 19. Remove the Hose Clamp

24. Pull out the Inner Housing 25 of the Hose Mount 26 at the

other end of the Connection Hose 19.

Hold the Inner Housing 25 in place and unscrew the Connec-

tion Hose 19.

Inserting a New Connection Hose

To insert a new Connection Hose 19, hold the Inner Hous-

ing 25 in place and screw in the new Connection Hose 19 all

the way. Fit the hose Hose Clamp 24 on the other side of the

Connection Hose 19. Position the screw head so that you can

tighten the Hose Clamp 24 eﬀortlessly on the Sanding Head

11 with a screwdriver with a torque of around 17.7 Lbf-in

(2 Nm).

Adjusting the Internal/External Airﬂow

switch position type of airﬂow use

1 - External airﬂow Ideal for sanding walls at high sanding speeds without

vacuum suction.

2 - Mixed external and internal airﬂow Medium sanding performance with low vacuum suction.

3 - Mixed external and internal airﬂow Ideal for sanding ceilings at low sanding speeds but with

high vacuum suction.

-18-

Dry Wall Sander Operation

19

24

25

25 25

25

26

Fig. 9

-19-

Troubleshooting

Problem Cause Corrective Action

The drywall sander does not run

smoothly or jolts across the surface.

The suction eﬀect is too strong. Reduce the suction power or switch to

external dust extraction, if necessary.

The joint compound material and/or

substrates are hard.

Reduce the suction power or switch to

external dust extraction, if necessary.

Reduce the speed.

The removal rate of the material being

sanded is too high.

The drywall sander's speed is too high. Reduce the speed.

The suction eﬀect on the drywall

sander is too strong.

Reduce the suction eﬀect or switch to

external dust extraction.

The joint compound material has a high

proportion of compound or is very soft.

Switch on the external dust extraction,

set the suction power thumbwheel to

setting 6 and, in extreme cases, reduce

the speed.

The grit of the abrasive is too coarse. Use a sanding sheet with a ﬁner grit.

The surface quality is not optimal. The grit of the abrasive is too coarse. Use a sanding sheet with a ﬁner grit.

The drying times for the joint

compound material have not been

observed.

Refer to the technical information

sheets and manufacturer's recom-

mendations.

The suction eﬀect is too strong. Reduce the suction power.

The joint compound material has a high

proportion of ﬁller or is very soft.

Use a sanding sheet with a ﬁner grit.

The drywall sander's head scratches

the drywall while operating (scoring).

Position the power tool before switch-

ing it on.

Work on the surface and always work

with the removable brush segment.

There are sanding marks on the

surface.

The hard sanding pad has been posi-

tioned at an angle on the surface.

Use a soft sanding pad with an interme-

diate pad.

In the case of very soft joint compound

material, the sanding pad is too hard or

the grit of the abrasive is too coarse.

Use a soft sanding pad with an interme-

diate pad.

Choose a ﬁner abrasive grit.

-20-

Problem Cause Corrective Action

The suction eﬀect is insuﬃcient. The suction power on the dust extrac-

tor is too low.

Increase the suction power on the dust

extractor.

The drywall sander's speed is too high. Reduce the speed.

The internal dust extraction on the

drywall sander is too low.

Reduce the suction power or switch to

external dust extraction.

The joint compound material has a high

proportion of compound or is very soft.

Switch on the external dust extraction,

set the suction power thumbwheel to

setting 6 and, in extreme cases, reduce

the speed.

The main ﬁlter on the dust extractor is

blocked/jammed.

Clean the ﬁlter element regularly:

Option 1: Set the suction power regu-

lation to the maximum suction power.

Seal the nozzle, extraction hose or in-

take port on the dust extractor with the

palm of your hand for 10 seconds until

the automatic cleaning starts.

Option 2: Clean the ﬁlter element me-

chanically (extraction).

Option 3: Check the ﬁlter element for

damage and blockages. Insert a new

ﬁlter element regularly.

A ﬂeece dust bag is being used. Use a waste disposal dust bag.

The extraction hose is blocked or

twisted.

Remove the blockage or untwist the

hose.

The dust extractor's dust container

is full.

Empty the dust extractor's dust

container.

Troubleshooting

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Bosch GTR55-85 9 User manual

Bosch GTR55-85 9 User manual

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